Conics: Standard Form of an Ellipse

$\frac{x^2}{2} + y^2 = 274$

$\frac{x^2}{4} - \frac{y^2}{9} = 1$

$x^2 + y^2 = 7$

$\frac{x^2}{3} = y^2$

$x^2 = 36 - 4y^2$